JPH053789U - Anticorrosion structure of pipe joint - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent corrosion of the water contact part on the inner side of the sealing material of the pipe joint and prevent rust from flowing into the pipe even if rust occurs. [Structure] The insertion-portion seal body 7 is attached to the tip of the insertion-port 2, and the reception-portion seal body 8 is attached to the rear end of the reception opening 1. The outer peripheral edge of the flange portion 7b of the insertion sealing body 7 is brought into pressure contact with the sealing tube portion 8c of the receiving sealing body 8. Due to the sealing action of these sealing bodies 7 and 8, the in-pipe fluid is prevented from entering the space on the inner side of the sealing material 3 and rusting is prevented. Even if rust occurs, this rust is prevented from flowing into the pipe.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a pipe joint anticorrosion structure.

[0002]

[Prior Art]

 As a commonly used conventional pipe joint, as shown in FIG. 4, the insertion port 12 is inserted into the reception port 11, and the tapered surface 14 of the inner periphery of the opening end of the reception port 11 and the outer peripheral surface of the insertion port 12 are inserted. There is a structure in which a seal material 13 is arranged between the two and the seal material 13 is pressed by a push ring 15. Further, as shown in FIG. 5, an annular groove 24 is provided on the inner peripheral surface of the receiving opening 21 and a sealing material 23 is arranged therein, and the annular groove 24 and an insertion opening to be inserted into the receiving opening 21 are provided. A structure in which the sealing material 23 is compressed between the sealing material 23 and the sealing material 22 has been widely used.

In these conventional pipe joints, a fluid such as water intrudes into the inner peripheries of the receiving ports 11 and 21 and the outer peripheries of the insertion ports 12 and 22 behind the sealing materials 13 and 23. To do. Therefore, as shown by the short diagonal lines in FIGS. 4 and 5, the outer peripheral surfaces of the distal end portions of the insertion openings 12 and 22, the distal end surfaces thereof, the inner peripheral surface of the inner portions of the receiving openings 11 and 21, and the inner portion thereof. The end faces are the water contact parts 16 and 26.

By the way, the mortar linings 18 and 28 are usually provided on the inner peripheral surfaces of the tube body portions 17 and 27 extending from the rear side of the receiving ports 11 and 21 to the tips of the insertion ports 12 and 22 to prevent corrosion. Are prevented from occurring. Further, the above-mentioned water contact parts 16 and 26 are also usually subjected to anticorrosion coating in the tube manufacturing process.

[0005]

[Problems to be solved by the device]

 However, even if the wetted parts 16 and 26 are coated with anticorrosion, there is a problem that the coating film gradually deteriorates during long-term exposure to the fluid in the pipe and may cause rusting. . In addition, especially when the pipe is cut for adjusting the pipe length, the cut end faces at the tips of the insertion openings 12 and 22 are exposed, and even if the cut end faces are repair-coated with a quick-drying paint, the repair painting is insufficient. In such a case, there is a problem that rust easily occurs in a short period of time.

Therefore, the present invention solves such a problem, prevents corrosion of the water contact portion on the inner side of the sealing material, and prevents rust from flowing into the pipe even if rust occurs. With the goal.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a pipe joint in which an insertion port is inserted and joined into a receiving port, in which a first tubular portion that fits on the inner circumference of the distal end portion of the insertion port and a distal end surface of the insertion port are provided. A ring-shaped sealing body for insertion having a brim portion for covering, a second tubular portion that fits on the inner periphery of the tubular body portion on the far side from the receiving opening, and a shoulder portion that covers the rear end surface of the receiving opening. An annular sealing member for the receiving end that covers the inner surface of the inner portion of the receiving opening, and has an inner peripheral surface having a seal tube portion to which the outer peripheral edge of the flange portion of the insertion opening is pressed. Also, the first and second elastic fixing rings that are open to each other and are fitted to the inner circumferences of the first tubular portion of the insertion sealing body and the second tubular portion of the receiving sealing body, respectively. Be prepared.

[0008]

[Action]

 According to this structure, the first cylindrical portion of the insertion opening sealing body is pressed and fixed to the inner peripheral surface of the distal end portion of the insertion opening by the first elastic fixing ring, so that this portion is sealed. Be done. The second tubular portion of the mouthpiece sealing body is pressed and fixed by the second elastic fixing ring to the inner surface of the tubular body portion deeper than the mouthpiece to seal this portion. It However, since the outer peripheral edge of the flange portion of the insertion sealing body is pressed against the inner peripheral surface of the sealing tube portion of the receiving sealing body, this portion is also sealed. Further, since the outer peripheral edge of the flange portion of the insertion sealing body is pressed against the inner peripheral surface of the sealing tube portion of the reception sealing body, a seal is provided between the insertion sealing body and the reception sealing body. To be done. Therefore, it is possible to reliably prevent the surfaces of the receiving port and the insertion port on the inner side of the receiving port with respect to the seal material of the pipe joint from being exposed to the fluid in the pipe.

[0009]

【Example】

 In FIG. 1, 1 is a receiving port formed at one end of one pipe, and 2 is an insertion port formed at the other end of the other pipe. The insertion port 2 is inserted into the inside of the receiving port 1, and the two tubes are joined to each other. 3 is a sealing material, which is arranged in an annular groove 4 formed on the inner periphery of the receiving opening 1 and is compressed by the bottom surface of the annular groove 4 and the outer peripheral surface of the insertion opening 2 inserted inside the receiving opening 1. , A predetermined seal surface pressure is generated. A mortar lining layer 6 is formed on the inner peripheral surface of the tubular body portion 5 from the innermost portion of the receiving opening 1 to the tip of the insertion opening 2.

Similar to the conventional pipe joint shown in FIG. 5, the inner peripheral surface of the receiving opening 1 on the inner side of the annular groove 4, the rear end surface of the receiving opening, the outer peripheral surface of the distal end portion of the insertion opening 2, and the distal end. The surface is anti-corrosion coated. When the pipe is cut to obtain the desired pipe length, the tip surface of the insertion port is repair-painted.

An annular rubber seal member 7 for insertion is attached to the tip of the insertion port 2. As shown in FIGS. 1 and 2, the insertion-portion seal body 7 covers the tip end surface of the insertion opening 2 and the cylindrical portion 7a that fits on the inner circumference of the tip end of the insertion opening 2. Has a brim portion 7b which is in close contact with.

A ring-shaped rubber sealing member 8 for the receiving port is attached to the inner portion of the receiving port 1. The mouthpiece sealing body 8 covers the inner end surface of the mouthpiece 1 and a tubular portion 8a which fits in the inner circumference of the tube body immediately behind the innermost end surface of the mouthpiece 1. It has a close shoulder portion 8b and a seal tube portion 8c which covers the inner peripheral surface of the inner portion of the receiving port 1 near the rear end surface and is in close contact with this inner peripheral surface. The outer peripheral edge of the flange portion 7b of the insertion sealing body 7 is brought into pressure contact with the seal tube portion 8c so as to seal between the both. An inner peripheral projection 8d is formed on the inner periphery of the tip of the seal cylinder 8c to prevent the collar 7b from coming off the seal cylinder 8c.

Elastic fixing rings 9, 9 are attached to the inner peripheries of the cylindrical portions 7a, 8a of the insertion-portion sealing body 7 and the receiving-portion sealing body 8, respectively. The elastic fixing rings 9, 9 are formed by a strip plate made of stainless spring steel which can be opened in one direction in the circumferential direction, and by pressing the cylindrical portions 7 a, 8 a against the inner surface of the mortar lining layer 6, The tubular portions 7a and 8a are fixed in a sealed state.

When joining the pipe joint having such a structure, as shown in FIG. 3, the tubular portion 7 a of the insertion-portion seal body 7 is inserted into the distal end portion of the insertion port 2, and the collar portion 7 b is inserted. Touch the tip of the insertion slot 2. Next, the elastic fixing ring 9 is reduced in diameter and inserted into the cylindrical portion 7a, and then the diameter is expanded, whereby the insertion-portion seal body 7 is attached to the distal end portion of the insertion opening 2. In the same manner, the socket seal member 8 is attached to the inner part of the socket 1. Then, after the sealing material 3 is placed in the annular groove 4, the insertion port 2 is inserted into the inside of the receiving port 1 to complete the joining of the pipe joints as shown in FIG. At this time, the flange portion 7b of the insertion-portion seal body 7 rides over the inner peripheral projection 8d of the receiving-portion seal body 8 and enters the inner peripheral side of the seal tubular portion 8c, and the outer peripheral edge of the seal tubular portion 8c. Press contact with the inner surface.

In this joining completed state, the sealing material 3 arranged in the annular groove 4 on the inner periphery of the receiving opening 1 is compressed by the bottom surface of the annular groove 4 and the outer peripheral surface of the insertion opening 2, A seal as a pipe joint is secured. Further, the insertion-portion seal body 7 and the insertion-portion seal body 8 are attached and fixed to the distal end portion of the insertion slot 2 and the rear end portion of the reception port 1, respectively. Since the outer peripheral edge of 7b is in pressure contact with the seal tubular portion 8c of the receiving seal body 8, it is possible to prevent the fluid in the pipe from entering the gap between the receiving openings on the inner side of the sealing material 3. It

Therefore, the tip end surface and the outer peripheral surface of the insertion opening 2 and the inner end surface and the inner peripheral surface of the inner portion of the receiving opening 1 are not exposed to the fluid in the pipe, and their corrosion is prevented. Even if rust occurs, it is prevented that the rust flows into the pipe.

In the above-described embodiment, the annular groove 4 is provided on the inner circumference of the receiving opening 1 to arrange the sealing material 3, and the sealing material 3 is compressed between the bottom surface of the annular groove 4 and the outer peripheral surface of the insertion opening 2. Although an example of a pipe joint of the type shown in FIG. 5, that is, a pipe joint similar to that shown in FIG. 5, is shown, the present invention is similarly applicable to the pipe joint of the type shown in FIG.

[0018]

[Effect of the device]

 As described above, according to the present invention, the insertion-portion seal body is attached to the distal end portion of the insertion opening, and the reception-portion seal body is attached to the rear end portion of the reception port. Part is pressed and fixed to the inner peripheral surface of the pipe at the tip of the insertion opening and the inner peripheral surface of the pipe at the inner part of the receiving opening, respectively, and the outer peripheral edge of the flange portion of the sealing body for opening is pressed against the sealing cylinder of the sealing body for opening. Therefore, it is possible to prevent the fluid in the pipe from entering the gap between the receiving and inserting openings on the inner side of the sealing material of the pipe joint. For this reason, the tip end surface and outer peripheral surface of the insertion opening, and the inner end surface and inner peripheral surface of the receiving opening are not exposed to the fluid in the pipe, so that they can be prevented from corroding and even if rust occurs. The rust can be prevented from flowing into the pipe.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an anticorrosion structure for a pipe joint according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing only the insertion-portion sealing body and the receiving-portion sealing body in FIG. 1 together with an elastic fixing ring.

FIG. 3 is an exploded perspective view showing a procedure for attaching the insertion-portion seal body to the insertion port.

FIG. 4 is a vertical cross-sectional view showing a conventional pipe joint anticorrosion structure.

FIG. 5 is a vertical cross-sectional view showing another conventional corrosion protection structure for a pipe joint.

[Explanation of symbols]

 1 Receptacle 2 Insertion 7 Sealing body for insertion 7a Cylindrical part 7b Collar 8 Sealing body for receiving 8a Cylindrical part 8b Shoulder 8c Cylindrical part 9 Elastic fixing ring

Claims (1)

[Claims for utility model registration] [Claim 1] In a pipe joint in which an insertion port is inserted and joined in a receiving port, the first tubular portion and the insertion port that fit on the inner circumference of the distal end portion of the insertion port A second cylindrical portion that fits in the inner circumference of the tubular body portion on the inner side of the receiving opening and a rear end surface of the receiving opening is provided, which has an annular sealing body for insertion that has a brim portion that covers the tip end surface. Shoulders,
A ring-shaped receiving-portion seal body having an inner surface of a back portion of the receiving opening and an inner peripheral surface thereof having a seal tube portion with which an outer peripheral edge of a flange portion of the insertion-portion sealing body is in pressure contact, and It is provided with first and second elastic fixing rings that are fitted to each other on the inner circumferences of the first tubular portion of the insertion sealing body and the second tubular portion of the receiving sealing body. Characteristic pipe joint anti-corrosion structure.